http://www.ionli-battery.com/l....i-ion-battery-cell/c
The energy density of the 21700Li ion cell is better than that of the 18650 battery. Under existing conditions, the energy density of its 21700 battery system is about 300Wh/kg, which is about 20% higher than the 250Wh/kg of its original 18650 battery system.
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